 /*******************************************************************************
  * Copyright (c) 2004, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.themes;

 import java.util.Set ;

 import org.eclipse.core.commands.common.EventManager;
 import org.eclipse.jface.resource.ColorRegistry;
 import org.eclipse.jface.resource.FontRegistry;
 import org.eclipse.jface.util.IPropertyChangeListener;
 import org.eclipse.jface.util.PropertyChangeEvent;
 import org.eclipse.ui.themes.ITheme;

 /**
  * @since 3.0
  */
 public class CascadingTheme extends EventManager implements ITheme {

     private CascadingFontRegistry fontRegistry;

     private CascadingColorRegistry colorRegistry;

     private ITheme currentTheme;

     private IPropertyChangeListener listener = new IPropertyChangeListener() {

         public void propertyChange(PropertyChangeEvent event) {
             fire(event);
         }
     };

     /**
      * @param colorRegistry
      * @param fontRegistry
      */
     public CascadingTheme(ITheme currentTheme,
             CascadingColorRegistry colorRegistry,
             CascadingFontRegistry fontRegistry) {
         this.currentTheme = currentTheme;
         this.colorRegistry = colorRegistry;
         this.fontRegistry = fontRegistry;

         fontRegistry.addListener(listener);
         colorRegistry.addListener(listener);
     }

     /**
      * @param event
      */
     protected void fire(PropertyChangeEvent event) {
         Object [] listeners = getListeners();
         for (int i = 0; i < listeners.length; i++) {
             ((IPropertyChangeListener) listeners[i]).propertyChange(event);
         }
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#addPropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener)
      */
     public void addPropertyChangeListener(IPropertyChangeListener listener) {
         addListenerObject(listener);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#removePropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener)
      */
     public void removePropertyChangeListener(IPropertyChangeListener listener) {
         removeListenerObject(listener);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#getId()
      */
     public String getId() {
         return currentTheme.getId();
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#getLabel()
      */
     public String getLabel() {
         return currentTheme.getLabel();
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#getColorRegistry()
      */
     public ColorRegistry getColorRegistry() {
         return colorRegistry;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#getFontRegistry()
      */
     public FontRegistry getFontRegistry() {
         return fontRegistry;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#dispose()
      */
     public void dispose() {
         colorRegistry.removeListener(listener);
         fontRegistry.removeListener(listener);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#getString(java.lang.String)
      */
     public String getString(String key) {
         return currentTheme.getString(key);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#getInt(java.lang.String)
      */
     public int getInt(String key) {
         return currentTheme.getInt(key);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#getBoolean(java.lang.String)
      */
     public boolean getBoolean(String key) {
         return currentTheme.getBoolean(key);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.themes.ITheme#keySet()
      */
     public Set keySet() {
         return currentTheme.keySet();
     }

 }

